Calculation of the secondary bending moment effect in the single-sided welded joints
Bobylev, Vladislav (2021)
Diplomityö
2021
School of Energy Systems, Konetekniikka
Kaikki oikeudet pidätetään.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2021120759343
https://urn.fi/URN:NBN:fi-fe2021120759343
Tiivistelmä
In this study, the effect of the secondary bending moment in the single-sided welds is investigated. The research was based on comparison analysis of analytical and experimental results. The current EN 1993-1-8. 2005 code does not provide explicit guidance for design calculation of the single-sided welds; therefore, the main focus is made on the alternative design verification guide described in Teräsnormikortti № 24/2018.
The analytical results strength capacities were calculated according to EN 1993-1-8:2005 and Teräsnormikortti № 24/2018. Experimental tests consist of the tensile tests of single-sided welded plate connections made of S355 and S700 with total amount of 8 specimens. Four weld geometries with different eccentricity values are designed for laboratory tests. Explicit analysis of laboratory tests is conducted by means of Finite element analysis in FEMAP software.
Comparison of strength capacities obtained by directional method provided in EN 1993-1-8: 2005 and actual capacities, indicated that EN 1993-1-8:2005 was not capable of making safe predictions for welds with relatively high eccentricity. On the contrary, results obtained with Teräsnormikortti № 24/2018 verified the ability of modified calculation model toproduce safe prediction for single-sided fillet welds. Although, Teräsnormikortti strength predictions for welds with relatively small eccentricity (0,5 mm) correlated well with test
results, in case of specimens possessing larger eccentricity (>2 mm), obtained prediction were overconservative. Further, finite element analysis facilitated identification of results variation cause, which was clamping conditions of the test specimens which prevented development of maximum bending moment amplitude. According to the results, it can be concluded that design calculation of single-sided welded joints considering eccentricity is challenging due to major dependence on local structure rigidity.
The analytical results strength capacities were calculated according to EN 1993-1-8:2005 and Teräsnormikortti № 24/2018. Experimental tests consist of the tensile tests of single-sided welded plate connections made of S355 and S700 with total amount of 8 specimens. Four weld geometries with different eccentricity values are designed for laboratory tests. Explicit analysis of laboratory tests is conducted by means of Finite element analysis in FEMAP software.
Comparison of strength capacities obtained by directional method provided in EN 1993-1-8: 2005 and actual capacities, indicated that EN 1993-1-8:2005 was not capable of making safe predictions for welds with relatively high eccentricity. On the contrary, results obtained with Teräsnormikortti № 24/2018 verified the ability of modified calculation model toproduce safe prediction for single-sided fillet welds. Although, Teräsnormikortti strength predictions for welds with relatively small eccentricity (0,5 mm) correlated well with test
results, in case of specimens possessing larger eccentricity (>2 mm), obtained prediction were overconservative. Further, finite element analysis facilitated identification of results variation cause, which was clamping conditions of the test specimens which prevented development of maximum bending moment amplitude. According to the results, it can be concluded that design calculation of single-sided welded joints considering eccentricity is challenging due to major dependence on local structure rigidity.